Image scanner

Abstract

In an image scanner including an original bed, a feeding means for feeding an original placed on the original bed, and an image sensor adapted to be scanned across the original in a direction perpendicular to a paper feeding direction of the original; the improvement comprising a pointer adapted to be moved in parallel to a plane of the original and point a scan starting position and a scan ending position on the original, an encoder for detecting a quantity of movement of the pointer, and a setting means for setting the scan starting position and the scan ending position according to an output signal from the encoder.

What is claimed is: 
     
       1. In an image scanner including an original bed in a plane, a feeding means for feeding an original placed on said original bed in a paper feeding direction, and an image sensor which is operated to scan across said original in a direction perpendicular to the paper feeding direction of said original as said original is fed by said feeding means in front of said image sensor, the improvement comprising:   a pointer moved in parallel to the plane of said original for pointing at a scan starting position and a scan ending position on said original;   an encoder for detecting a quantity of movement of said pointer between said scan starting position and said scan ending position, said encoder including a wire which is connected to said pointer and encoding means which is rotated with the movement of said wire by said pointer and provides a signal indicative thereof, said wire being wound up with said encoder when said pointer is not operated; and   a setting means for setting a corresponding scan starting position and a scan ending position for the operation of said image sensor to scan said original according to the signal from said encoder.